Stenochironomus Kieffer 1919

Key to adult males of Stenochironomus from China

(adapted from Qi et al. 2015)

1 Inferior volsella with a well-developed terminal spine........................................................ 2

- Inferior volsella without a well-developed terminal spine..................................................... 9

2 Wing membranes with dark pigmentation.................................................................. 3

- Wing membranes without any pigmentation................................................................ 4

3 Legs almost entire brown; wing with dark pigment restricted to a part area....................................... 4

- Legs yellow; entire wing smoky gray............................................... S. maculatus Borkent, 1984

4 Wing with dark band between veins C and M pale...................................... S. gibbus (Fabricius, 1805)

- Wing with two dark spots surrounding the RM and FCu................... S. xianjuensis Zhang, Gu, Qi & Wang, 2016

5 Apex of anal point swollen and rounded................................................................... 6

- Apex of anal point not swollen and rounded................................................................ 8

6 Superior volsella with 9–12 setae; posterior margin of tergite IX with 10–14 setae and 4–8 spines..................... 7

- Superior volsella with 4 setae; posterior margin of tergite IX with 14–16 setae............... S. koreanus Borkent, 1984

7 Superior volsella much beyond posterior margin of tergite IX; anal lobe reduced............. S. zhengi Lin & Liu sp. nov.

- Superior volsella small, finger-like; anal lobe developed...................... S. linanensis Qi, Lin, Liu & Wang, 2015

8 Posterior edge of tergite IX with 8 long setae and 6 spines; anal point parallelsided........... S. macateei (Malloch, 1915)

- Posterior edge of tergite IX with 14 long setae, without any spine; anal point roughly triangular, apically pointed................................................................................ S. mucronatus Qi, Shi & Wang, 2008

9 Wing membranes with dark pigmentation................................................................. 10

- Wings without any pigmentation or with narrow pigment areas around RM and along veins M 3+4 and Cu 1.............. 12

10 Abdomen and hypopygium light yellow................................................ S. inalemeus Sasa, 2001

- Abdominal tergites I-IV light yellow, tergites V-VIII light brown, hypopygium dark brown......................... 11

11 Preepisternum with brown spots; anal point apically rounded......................... S. nubilipennis Yamamoto, 1981

- Preepisternum without any pigmentation; anal point apically pointed.............. S. satorui (Tokunaga & Kuroda, 1936)

12 Posterior margin of tergite IX with spines................................. S. brevissimus Qi, Lin, Liu & Wang, 2015

- Posterior margin of tergite IX without spines.............................................................. 13

13 Entire body yellow, without dark pigmentation; inferior volsella with 3 long setae...... S. hainanus Qi, Shi & Wang, 2008

- Body yellow, with brown spots on thorax, abdomen, hypopygium and legs; inferior volsella with 6 long setae.......................................................................................... S. totifuscus Sublette, 1960